Prince William celebrates his 29th birthday (at work)

Just-married Prince William is celebrating his 29th birthday at work.

The prince, a helicopter search and rescue pilot in the Royal Air Force, will be on duty Tuesday at a base on an island off the coast of Wales, and is expected to mark his birthday privately.

But there is at least one public acknowledgement of the just-married royal turning the big 2-9. On Westminster Abbey’s official Twitter feed came the tweet: “The Abbey bells are ringing to mark the birthday of the Duke of Cambridge.” That title was conferred on Prince William on April 29, the day of his wedding to Kate Middleton.

The prospect of a low-key birthday might appeal to the prince following those blow-out nuptials, viewed live by millions around the world.

He is also due to travel to Canada and the United States next month on his first official overseas trip as a married man. It sounds a bit like a second honeymoon, with campfires, a canoe trip in the wilderness, a full day free of any responsibilities, and a chance to see Canada in its full summer glory. But it will be a working trip for the prince and his bride, filled with charity events, speeches, the laying of wreaths and military displays.

William also plans to demonstrate his skills as a helicopter rescue pilot by taking part in a demonstration of how to land a helicopter on water — a specialty of Canadian forces. But he’ll also trade his pilot gear for an apron when he and Kate take part in a cooking workshop in Quebec City.

After the Canadian leg of their trip, the Duke and Duchess of Cambridge will head to Hollywood, where they’ll attend a black-tie dinner at LA's renovated Belasco Theater to introduce young British film talent to Hollywood executives.

Attending to duty on a day of celebration is a royal tradition: William's grandfather, Prince Philip, recently marked his 90th birthday with a full day of official engagements.